Common traits:
Three part body Head - Thorax - abdomen
Six Legs
Antennas
Compound eyes

Order Archaeognatha (bristletails)
Order Thysanura (silverfish)
Order Ephemeroptera (mayflies)
Order Odonata (damselflies and dragonflies)
Order Orthoptera (crickets and grasshoppers)
Order Plecoptera (stoneflies)
Order Grylloblattodea (rock crawlers)
Order Phasmotodea (stick and leaf insects)
Order Dermaptera (earwigs)
Order Mantodea (mantids)
Order Blattodea (cockroaches)
Order Isoptera (termites)
Order Embioptera (web-spinners)
Order Zoraptera (angel insects)
Order Psocoptera (barklice and booklice)
Order Phthiraptera (parasitic lice)
Order Hemiptera (bugs)
Order Thysanoptera (thrips)
Order Megaloptera (dobsonflies and alderflies)
Order Rapdhidioptera (snakeflies)
Order Neuroptera (antlions and lacewings)
Order Coleoptera (beetles)
Order Strepsiptera (strepsipterans)
Order Mecoptera (scorpionflies)
Order Siphonaptera (fleas)
Order Diptera (flies)
Order Trichoptera (caddisflies)
Order Lepidoptera (moths and butterflies)
Order Hymenoptera (bees, wasps, ants, sawflies)